... (adjustable 20mm), optional 250mm apochromatic objective. 3, the primary mirror with a damping control system that moves the optical lens can ... .4X, 5.1 X, 8.3 X, 13.5 X, 20.5 X3, depending on the field diameter: Φ66mm, Φ41mm, Φ26mm ... , single head teaching microscope, binocular assistant microscope, internal or external camera and interface, and digital radiography systems and interfaces.Thanks for ...